Sounds like the pipes are reacting to one another, rather than en-masse to
the surrounding ground, much like Ed says.
Out of curiosity I would run it with solely a single earth, and then try two
pipes alongside one another, as I wonder if pipes of dissimilar metal would
behave differently to two of the same metal?
Phil
-----Original Message-----
From: undisclosed recipient [mailto:arcin_n_sparkin@xxxxxxxxx]
Sent: 16 June 2016 13:11
To: Phil
Subject: pipes rattling
Yes.
When I have it tuned for top running (still working on primary coil
resonance) with what I had, it did it every time.
At first I thought it was the motor in either the washer or dryer, but then
I grabbed the faucets for the washer and they were shaking to beat the band.
All I can figure is that the emf from the primary is somehow causing them to
resonate.
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